US1359394A

US1359394A - Intermittent and oscillatory rotary cut-off saw-machine

Info

Publication number: US1359394A
Application number: US165174A
Authority: US
Inventors: Jr James Marshall Leaver
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-04-28
Filing date: 1917-04-28
Publication date: 1920-11-16
Anticipated expiration: 1937-11-16

Description

J. M. LEAVER, JR. .INTERMITTENT AND OSCILLATORY ROTARY CUT-OFF SAW MACHINE.

APPLICATION FILED APR. 28, 19!?- Patented Nov. 16, 1920.

8 SHEETS-SHEET I.

Jar/zafiMLeaz/egm; INVENTO R,

W ITNESSES All) ATTORNEY Patented Nov. 16, 192 0.

8 SHEETSSHEET 2- 1. LEAVER, In. INTERMITTENT AND OSCHILATORY ROTARY CUT-OFF SAW MACHINE.

APPLICATION FILED APR.28, 19'1- WMLeav6a7 ATTORNEY I WITYQ ESSES J. M. LEAVER, 1n. INTERMITTENT AND OSCILLATORY ROTARY CUT-OFF SAW MACHINE. APPLICATION FILED APR.2B, 1911.

1,359,394, Patnted Nov. 16,1920.

8 SHEETSSHEET 3- Jamar JfLeavegJ WITNESSES ATTQRN EY L-M. LEAVER, 1. I INTERMITTENT AND OSCILLATORY ROTARY CUT-OFF SAW MACHINE. APPLICATION F ILED APILZB, ISIT.

. Patent edNov. 16,1920.

8 SHEETS-SHEET 4.

' INVENTOR, WITNESSES ATTORNEY J. M. LEAVER JR.

INTERMITTENT AND OSCILLATORY ROTARY CUT-OFF SAW MACHINE.

APPLICATSON HLED APR. 28, I917.

. 0 2. T mm mr mm m m m M m m J. M. x. 3 s 9 5 S M 1 M ATTO R N EY 1; M. LEAVER, 1R. INIERMITTENT AND OSCILLATORY ROTARY CUT-OFF SAW MACHINE.

I APPLICAT ION FILED APR. 28, l9l7- 1.359394. Patented Nov. 16, 1920.

a $HEETS$HEE T 5- 6 gal 67 M ////7// ///////////I 4 w 1 Jm MLw6I Ji;lNVENTOR WITNESSES J. M. LEAVER, JR.

INTERMITTENT AND OSCILLATORY ROTARY CUT-OFF SAW MACHINE.

APPLICATION FILED APR. 26, 19.

1,359,394. I 4 PawntedNov. 16,1920.

8 SHEETS-SHEET 7- WITNESSES ATTORN EY ATTORNEY LEAVER, JR. INTERMITTENT AND OSCILLATORY ROTARY CUT-OFF SAW MACHINE.

APPLlCATlON FILED APR- 28, 1917- 1,359,394.

cfzirzwMLaavendi; INVENTQR,

WITNESSES UNITED STATES PATENT OFFICE. T

JAMES MARSHALL LEAV EIBI, JR., OF OAKLAND, CALIFORNIA.

INTERMITTENT AND OSCIIILLA'JJORY ROTARY CUT-OFF SAW-MACHINE.

Application filed April 28,

To all whom it may concern Be it known that 1, JAMES M. LEAVER, J r.', a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented a new and useful Intermittent and Oscillatory Rotary Cut-Off Saw-Machine, of which the following is a specification.

This invention has reference to intermittent and oscillatory rotary cut off saw machines, and its object is to provide a particularly simple and eflicient rotary cut off saw machine capable of accurately severing lumber even of the most difficult kind with a minimum travel of the saw, the lumber remaining stationary during the cut off operation.

In accordance with the invention the saw, in its inactive position, is always below the top of the table receiving the work, and the saw is mounted upon an axis of rotation movable about another axis beneath the work-receiving table with the mounting rockable about the axis carrying it on a short radius, which radius may be considerably less than the radius of the saw. The arrangement is such that in the inactive position the teeth of the saw, which is a circular saw, are or may be close to that face of the work. considering the latter to be a board or the like, engaging the work-receiving table, and the axis of the saw is displaced from the axis ofbodily movement of the saw in a plane which may be approximately parallel with that face of the work presented toward the saw. movement of the saw is through an areshaped path, first approaching the work in a direction substantially perpendicular to the face toward the saw, and the saw then constantly moves both through the work toward the opposite face thereof and along the work toward one edge thereof until the movement of the saw is crosswise of the work, whereby there is an ever changing and sweeping cut with the burden of the workv on the front cutting edge ofthe saw so that the back cutting edge of the saw is relieved and smoother and finer work results than heretofore. Considering the work-receiving table as horizontal with the saw so mounted that at rest it is wholly beneath the 1 top of the table, the bodily movement of the saw is first upwardly into the work through the bottom face thereof and then progres- V sively upward and forward toward one Specification of Letters Patent.

The bodily Patented Nov. 16,1920.

1917. Serial No. 165,174.

edge of the work so that on wider pieces of work the saw may travel approximately parallel with the work leaving the work at the edge remote from that near where the saw entered the work.

The arrangement permits a saw of a certain diameter to cut off boards considerablyreduction in the capacity of the machine for wide cutting. Furthermore, the short radius of bodily travel of the saw in a curved path permits-the-use of a.relatively small diameter saw and avoids any material lost motion between the position of rest of the saw and its position of entrance into the work. The invention combines both a rising cut of the saw into the work and the sweep of the saw through the work crosswise of the latter, thus distinguishing from out off machines which either out through the work from face to face only, or cut through the work from edge to edge only.

The result is that the travel of the saw in traversing the Work is reduced to a minimum and the machine as a whole is correspondingly simplified and the floor space occupied is also greatly reduced. Moreover, the direction and character of the cut is such that it is true and is not deflected by hard spots in the wood, such as are encountered in heart wood. Also the liability of pinching the saw, which occurs when the cut proceeds from one edge of the work toward the other, is avoided.

The saw may be belt driven, in which case the invention contemplates a 'belt directing structure associated with the saw, so as to maintain the belt in a taut condition in all positions of the saw in its travel, and at the same time provide a sufiicient length of belt between the saw arbor and a drive shaft in the machine to insure a sufficient grip of the belt upon its drive pulley and .the saw' arbor pulley. Instead of depending upqn belt drive, the short-radius swing-of the saw arbor may be retained and gear drive be utilized. Such gear drive has the advantage of simplicity over the belt drive and freedom from liability of slipping and other disadvantages incident to belt drive.

The invention contemplates the employment of a simple and yet highly efiicient means for causing the saw to travel through the work and return to normal position, so

that the action is under the control of an scope of the appended claims.

In the draw1ngs:-

Figure 1 is an elevation of that end of a belt drive cut-oil? saw machine embodying the invention, the end seen in the drawing being that to the right of an operator using the machine.

Fig. 2 is a front to rear upright section taken between the saw and its drive pulley, as shown in the machine of Fig. 1, the saw and saw guard, which are removed in Fig. 2, being indicated in dotted lines.

Fig. 3 is a rear elevation of the machine of Fig. 1; that is, the elevation is the one seen from that portion of the machine opposite from the operators side.

Fig. 4 is a section on the line 4-4 of Fig 1. Y

' ig. 5 is a section'on the line 5-5 of Fig.

1, drawn on a larger scale and restricted to the saw portion of the machine, the swinging belt directing frame being omitted.

Fig. 6 is a section on the line 6-6 of Fig. 5;

ig. 7 is a detail view showing one of the arms of the swinging belt directing frame.

Fig-.8 is an elevation similar to Fig. 1 but drawn on a larger scale and limited to those parts of the machine immediately adjacent to the saw, 'the saw guard being shown in vertical section.

Fig. 9 is an elevation, partly in section, of a portion of the structure of Fig. 8 when in the position indicated in dotted lines, distant parts being omitted.

Fig. 10 is an end elevation similar to Fig. 1, but showing another arrangement of the parts.

Fig. 11 is a view of the spring shown in Fig. 10, with some immediately adjacent parts shown in section.

- of Figs. 1 and-11.

Fig. 13 is a dlagram representing the action of the saw.

Fig; 14. is an elevation like that of Fig. 1, but showing the saw mounted for being fed in the opposite direction.

Fig. 15 is a diagram like that of Fig. 13, but showing the action of the saw of Fig. 14. Referring first to the structure illustrated in F1gs. 1 to 7 inclusive, there is shown a frame 1 of web and flange construction, or any other suitable construction commonly employed in machines of the character of those to which the invention relates. The frame 1 is provided with a, table'2 for the support of the work, indicated in some of the figures of the drawing at 3. There isalso provided a straight edge or abutment 4 on the table 2, which straight edge may follow the usual custom as to construction and ad ustments, and'constitutes a work-locating means. There is further provided a saw guard 5 which may also follow the psual custom and needs no special descripion.

Mounted in the ends of the main frame 1 are brackets 6, in each of which there is located an anti-friction journal bearing 7,

indicated as a ball bearin but which may be of any suitable type. n each bearing 7 "there is mounted one end of a pivot pin 8,

the other end of which is made fast in a correspondlng arm or leg 8 of a yoke frame, of which the legs or arms are connected by a cross piece 9. One end of each leg or arm 8' is shaped to constitute a counterweight 10, while the other end of the leg is bored 1 out to receive an anti-friction journal hearing 11 similar to the bearing 7 and held in place by a cap plate 12 secured by screws 13 Mounted in theor otherwise to the arm 8. bearings 11 of the two arms 8 of the yoke frame is a saw arbor 14 carrying between the bearings a belt pulley 15 of ordinary construction. The! arbor 14 has an extenslon 16 at one end extending beyond the corresponding end of the main frame, and there is provided with clamp blocks 17, 18, for holding a circular or -rotary saw 19 on the arbor, the movable clamp block 18 being secured in place by a nut 20 screwed on to the arbor in the usual manner.

table 2 and enter the uard 5 when the saw is at the lowermost limit of its travel, whereby an operator standing at the same side of the table is protected from accidental contact with the saw.

Carried by those ends of the arms 8 in which the saw arbor is mounted are sleeves I The saw 19, 1s so located as to be close to one end of the 21, eatzh confining one end of a spacing bar 22 to the corresponding end of the yoke frame made up of the legs or arms 8 and cross piece 9, said yoke frame forming a counterbalanced carrier for the saw arbor and circular saw thereon.

In order to accurately adjust and hold the I a turning tool, so that the yoke frame carry-- ing the saw may be accurately adjusted crosswise of the machine, that is, lengthwise of the pivotal axis of the yoke frame and securely locked in its adjusted position.

Secured to each arm 8 in encirclingrela tion to the respective pivot pin 8 is a sprocket wheel 27 engaged by a sprocket chain 28 continued to a low part of the frame of the machine, where it engages another sprocket wheel 29 on a shaft 30 journaled on the sides of the frame 1. Mounted, on the shaft 30 is a pinion 31 in the path of a gear segment .32 faston a rock shaft 33 under the control of a pedal lever 34 provided with a foot treadle 35 within easy reach of an operator. In the path of the yoke arms or legs 8* or either of them, is a rest stop in the form of a block 36 held to the frame 1 by a set screw .37 which may extend through an elongated slot in the block 36 to permit adjustment ofthe latter, the purpose of the block being to limit the rocking of the saw-carrying yoke frame in a direction to lower the saw.

Near the lower portion of the main frame on the side of the latter remote from the operators side there are secured brackets 38 in which is journaled a drive shaft 39 carrying a pulley 40. At one end of the machine the drive shaft 39 carries another pulley 41 by means of which the machine may be driven by a belt coming from some convenient source of power..

Each bracket 38 has a sleeve 42 projecting toward the other bracket, the sleeves being on opposite sides of the pulley 40, and these sleeves carry journal rings 43 on the ends of a swinging frame 44 consisting of two legs of web and flange construction connected intermediately by a cross piece '45, or the swinging frame may be of anyuother suitable construction answering the purposes of the invention. The frame rises from the sleeves 42 surrounding the shaft 39 toward,

' but terminates short of the table 2. Near pulleys 46, 47, mounted on the upper end, the frame 44 carries idler 1pins or shafts 48 carried by the frame 44.

ear the upper end, the frame 44 is providedwith ears 49 carrymg pins 50 by means of which the ends of the spacing bars 22 remote from the saw arbor are pivotally connected to the frame in'rear of the idler pulleys.

A belt 51 extends about the saw arbor pulley 15, around the

idlers

46 and 47 and about the pulley 40, so that when power is applied to the pulley 41 it is transmitted through the shaft 39 to the pulley 40, and

thence by way of the belt 51, about the

idlers

46 and 47 to the arbor pulley 15. By properly proportioning the pulleys the desired speed of rotation is imparted to the saw.

The frame 44 is under the control of a spring 52 connected at one end to the frame 44 and at the other end to the main frame 1 at a convenient point. The tendency .of

the spring 52 is to move the frame 44 about I its pivotal support on the shaft 39 toward the saw, and then the weight of the saw and parts carrying it is sufiicient to overcome the counterweights 10,permitting the saw to drop to its normal or inactiveposition, wlth the edge of the saw just below the top of the table and a portion of the saw housed in the guard 5.

Assuming that the saw is rotating, the

work upon the table 2 with the latter entlrely free from any moving parts projecting above its surface, so that the operator operator places a board- 3 or other piece of may adjust the work to the desired position without any liability whatever of injury.v

With the work properly adjusted and either held by hand against the stop 4 and on the table 2, or by any suitable device,

such as a saw guard shown anddescribed in my copending application, No. 162,084,

filed April 14, 1917, for a guard for out off saws, the saw is started in the active direction by pressure applied to the treadle 35 of the lever 34 by the foot of the operator.

When the saw guard of the said applica- I means employed a rocking movement of the saw carrying yoke frame about the axis of the pivot pins 8. The result is that the saw is elevated, the first movement being sub- 1 stantiallyvertical and the work is engaged on its under face at, an'interme'diate point by the teeth-of the saw, so that the saw begins to enter the work while still traveling in a: nearly vertical though curved path. As

5 ment, which, however,- in the. particular showing of'Fig. 1 is away from the operator.-

'But, with the saw rotating in acounterclockwise'direction as viewed in Fig. 1, it,

forces the work toward the straight edge 4 and if the work be held down by a clamp such as is afforded by thesaw guard of'the aforesaid application, the work is steadily held while the cut off operation is progressing.

The radius of the are through which the saw travels in the arrangement of- Fig. 1 is less than half the diameter of the saw, while at the same time the saw is acting upon nearly the entire width of the work during its progress 'therethrough. Because of this the saw is not deflected by hard spots such as are found in heart wood, since as soon as D p inciding w1th the axls of the shaft 55, the

the saw has entered even a short distance, into the wood it has an extended engagement therewith; This alsoobviates any. pinching on the saw which sometimes occurs when the saw passes through the wood in the direction of the breadth thereof.

Moreover, the short radius of travel of the saw reduces the length of travel to a minimum.

Furthermore, the sweeping out not only permits and insures-straight and accurate cutting without any liability of the saw dodging if crowded or dull, or in the case Where warp and twist in the lumber causes tension'conditions which sometimes causes a .pinclfilig of the saw, when cutting in a direction from edge to ed e, sufficient to stop and heat the saw, but t 'e sweepingcut causes more saw teeth to engage at atimejin the cutting off of theboard, less coarsejsawdust is taken in proportion to the feed of the saw into or through the board, and faster and smoother cutting results.

The structure shown in Figs. 8 and 9 cmbodies the principles of the structure of Fig. i

- 1 andassociated figures in so far as concerns the feed of the saw through a rising are including a segment of a circle having a radius less than the radius of the saw, so

i that the feeding travel of the saw rises from a substantially horizontal plane in a curved path toward or even beyond the vertical, and "the saw enters the work atthe bottom surface thereof and progresses toward bothedges of the work at the same time, with the advantageous results already described.

The principal feature of'the structure of Figs.' 8' and 9 is the simple driving means for the saw. Carried by and fast to the saw ,arbor 14-is a pinion 53 in mesh with a gear .wheel 54 'on a drive shaft 55 in the axis of rocking of the saw carrying yoke frame pro- I vided with the arms orlegs 8*. -The frame lines at 62 in 1 is rovide'd with brackets'6 similar tothe brac ets 6 of Fig. 1, except that each bracket is.- provided with two sets of -

antifriction journal bearings

7 and 7 respectively! The bearings 7 each carry a sleeve 56 to which is made fast Ia respective one of the arms orlegs 8 ofthe yoke frame carrying the saw.v

Each sleeve" 56 encircles theshaft 55, which latter is supported at the ends in the journal bearings 7, and at one en'd'is screw-threaded as indicated at 57 'andtherehas a nut 58 applied to it. The journal bearings 7 are.

retained in the brackets 6 by cap plates 59. That end of the shaft 55 remote from the saw is provided with an axial extension 60. carrying a drivepulley 61 to which may be gear wheel 54 and pinion 53 always remain in mesh no matter to what extent the yoke frame is rocked. Furthermore, slipp ng between the drive shaft and the saw is wholly eliminated. I

The structure of Figs. 8 and 9 eliminates alldriving mechanism in the machine itself, except two gears, a drive shaft and a drive pulley, while the drive shaft is located in the axis of rocking of the saw carrying yoke frame, thus reducmg the driving mechanism to a minimum of parts;

In Figs'l and 8 the straight edge or abutment for the work is shown as located on the operators side of the machine. In Fig. 10 there is shown a machine similar in all respects to the showing of Fig. 1, except that the saw, the saw guard, and the work abutment or straight edge are located on the side 7 of-"the .machine remote .from the operator,

and there is also shown a somewhat different arrangement ofsprmg for returning. the

swinging frame 44 to its initial position after being dis laced therefrom.

Since t e structure of Fig. 10'is,' so far as the running parts of the machine are concerned, but a reversal of the arrangementof Fig. 1, the same reference numerals *are employed where the only difference resides in the reversal of certain parts.

Since in Fig. 10 the frame 44 1s swung away from the axis of rocking on the saw carrying yoke frame, insteadof toward it in the initialposition of the parts, as in Fig. 1,

thereis provided a compressionspring 63 wound upon the sprocket Wheel or drum 29,

as before, thus causing the saw carrying saw .frame to rock upon its pivot pins, but this time toward instead of away from the operator. frame 44 by the belt drive of the saw in a direction toward the operator, thus compressing the spring 63, and when the parts are released the expansion of the spring 63 thus compressed causes the swinging of the frame 44 away from the operator and the return of the parts to their first position.

The showing of Fig. 10 is indicative of the fact that the saw may be located either on the operators side of the machine or on the opposite side thereof. v

The machine shown in Fig. 12, while in principle the same as the machine of Fig. 1, differs somewhat in structure and serves to indicate, in connection with Figs. 1 and 8,

, that the invention is susceptible of various associated figures.

embodiments and demonstrating that the invention may be embodied in other structures than the particular onesillustrated.

In Fig. 12 there is shown a machine frame 1 differing somewhat in shape from the frame 1 of Fig. 1, because of the somewhat different structure of the machine of Fig. 12.

There is provided a saw 19 and guard 5 as before, and the frame 1 is provided with a work table 2 on which a board 3,representing the work, is shown. A straight edge or abutment 4 is also indicated in Fig. 12.

The saw is mounted upon an arbor 14 carrying a pulley 15, both of which may be substantially similar to the showing of Fig. 1 and associated figures. The arbor 14 is carried onthe upper end of an upright frame 68 connected near its lower end to links 69 similar to the spacing bars 22 of Fig. 1 and Near the lower end of theframe 1 there is journaled a shaft 7 0 in journal supports 71 secured to the frame, and this shaft carries a belt pulley 72 corresponding to the pulley 40 of Fig. 1. The shaft 70 may be assumed to carry another belt pulley for the application of power from a suitable source, but the second belt tively, around which'is directed a belt 75 similar to the l elt 51 of Fig. 1 and associated figures. and this belt is also carried around the pulley 15 of the saw arbor 14, the arrangcment being such that on movements of theframe 68 by means to be described, the belt 75 always remains taut. Furthermore, the length of the bolt is such as to insure fagainst slippage.

if A treadle lever 34 and gear segment 32,

" pinion 31, shaft 30 and drum or sprocket wheel 29 are provided in' the structure of This causes the rocking of the- Fig. 12 in correspondence with the arrangement shown in Fig. 1 and associated figures.

Mounted on studs 76 projecting from the sides of the frame 1 and at points below the arbor 14 are arcs 77 about which extend flexible strands 28 whether in the form of sprocket chains or belts, the action: being the same in either case. The arcs, of which only one is shown, are indicated as semicircular, but it will be understood that they may include either more or less than a semicircle, since in their action they have: a movement of less than 180, and seldom exceed more than about 90 in movement, although the range of movement provided may be more than 90, as indicated in dotted lines in Fig. 12. One arm of the are 77 connecting it'to a hub 78 mounted on the supporting pin 76 carries at its outer end a pin 79 which may be fast to or engage the corresponding side bar of. the frame 68.

When the treadle lever 34 is depressed, the

strand 28 is wound upon the drum or pinion scribes an are about the axis of the pin or" stud 76.

The lower end of the frame 68 because of the presence ofthe spacing bars or links 69 describes an are about the axis of the shaft 70, such are, because of the length of the links 69, being rather shallow. The combined action of the links 69 and the are 77 upon the frame 68 causes the saw 19 to rise for a distance in a nearly straight line, and then swing away from the abutment 4 in a curved path, but about a radius less than the radius of the saw in the particular arrangement shown in Fig. 12.

The same general entering action of the saw into the bottom surface of the workoccurs in Fig. 12 that occurs in the arrangement of Fig. '1, except that the saw enters more deeply into the work, while following an approximately ertical path, than occurs in the arrangement of Fig. 1.

It has heretofore been-the custom in rotary cut off saw machines to cause the saw to move into one edge of a board, if such particular material be the work operated upon, toward the other edge of the board, with the saw arbor moving in an arc of long radius, so that the progress'ofthe saw through the work is very close to a straight line extend- 1I1gCI'0SSW1Se, or in the direction of the .The saw mounting of this invention provides a disappearing saw having a travel about a short radius producing a sweeping cut through the board extending practically from edge to edge in narrower boards and only approaching a widthwise direction of travel near the edge from'which the saw leaves the board in wide boards.

The radius of the arc of travel of the saw need only be about one-third of the diameter of the saw. For instance, with a sixteen inch saw, boards up to fourteen inches in width and one, two or more inches in'thickness may be readily cutby a sweeping cut when the radius of travel of the saw is about five inches. To graphically illustrate the action of the saw reference is had to thediagram of Fig. 18, where the table 2, straight edge 4, work 3, saw 19 and the portion of the yoke frame between the arbor 14 of the saw and pivot 8 of the yoke frame and indicated at 8 are diagrammatically illlustrated.

The normal or inactive position of the saw is indicated in Fig. 13 in solid lines, with the then upper edge of the saw as close as practicable to the under surface of the work 3, which may be considered as a board two inches thick and fourteen inches wide in the full line illustration, or seven inches wide, or ten inches wide as indicated by the respective dotted lines 3*.

When the saw is raised about the pivotal axis 8, it enters the bottom of the board 3 near the straight edge a, entering the board between the two edges thereof and rising into the board from the bottom face toward the top face. I When the saw has raised sufficiently to completely sever the board 8 if it be considered as seven inches wide and two inches thick, the saw will have moved from the solid line position to the dotted line position 19? and the arbor 14 willhave moved from the full line position to the dotted line posi tion 14:. Considering the radius of movement 8 to be five inches, the rise of the arbor l'will represent a movement about the pivot 8 of about three inches. The board having been severed the foot pedal may be released and the saw allowed to drop to its first position. If the board be ten inches wide, then by the time "the saw has reached the dotted line position 19 the board of ten inch width will have been severed and the arbor 14 will have moved to the position 14 through a path of about eight inches in extent, the saw in both instances traveling upwardly from the bottom surface of the board to the top surface thereof, with the teeth of the saw engaging the board from edge to edge until the saw finally merges through the top edge of the board. There has been in eac case a progressive movement of the saw away from-the position of the straight edge 4, but this has not been 'suificient to bring about any edge to edge progressive cutting through the board.

If. the board be fourteen inches wide and two inches thick, then the saw is moved from the solid line position to the dotted line position 19 and the arbor 14 is moved from the full line position to the dotted line position 14. This means a short widthwise movement of the saw through the board, but throughout by far the greater portion of the board the saw bodily rises from the-under surface of the board to and through the top surface of the board with the kerf progrossing toward both edges of the board. In so wide a board as one offourteen inches with the short radius of movement of five inches, there is a travel of eight inches of the saw'arbor from the position of rest .to the point where the two inch b fourteen inch board is completely severe With a one'inch board the movements are less for the different Widths than those mentioned.

With disappearing saws as heretofore proposed the radius of the arc of travel is very much longer than with the saw of this invention. With a rotary circular saw of sixteen inches diameter the arc of travel of the structures heretofore proposed ranges from twelve to seventeen inches for a board fourteen inches wide, and then the saw rises give results like those obtained with the saw cutting away from the abutment. In Figs. 14 and 15 the feeding movement of the saw is toward the abutment and as the mechanical parts are the same as in Figs. 1 and 13 except as to the relative locations .(of the saw and carrying parts and the direction'of feed of the saw, the same refer-- ence'numerals are used and the description of the structure of Fig. 1 and diagram of Fig. 13 may be read upon Fig. '14 and the diagram of Fig. 15 a The short radius of movement whereby the rising action of the saw with respect to the work is obtained makes it possible to locate the saw so close to the top of the table that the cutting edge-is covered by the work and is but a very small fractional part of an inch removed from that. face of the work into which the saw first enters.

What is claimed is 1. A rotary cut-off saw machine having work-locating means and provided with a .rotary saw and a mounting therefor, both having a position of rest below the plane of thereto by said mounting through an ini 'tially rising arc and subsequently through progress crosswise of the work.

A 2. A rotary cut-ofi saw machine having work-locating means and provided with a rotary saw and a mounting therefor, both located below the plane of the work-locating means with the saw immediately belowthe work, said mounting having a direction and range of movement to cause the saw to rise into work-engaging position and enter the work intermediate of the width and nearer to one edge thereof than to the otheredge and move upwardly through and at the same time progressively across the work, and finally lowering toward the termination of the range of movement.

3. A rotary cut-off saw machine provided with a rotary saw and a mounting in which the arbor of the saw is journaled, said mounting having a pivotal axis parallel with the saw axis and spaced therefrom by while"-rotating" upwardly above the table a distance less than the radius of the saw. said machine having a table for work located with reference to the saw arbor and mounting therefor to permit an active rising and forward progressive movement of the saw to engage the under surface of the work intermediate of its width near one edge and rise bodily into and through the work and atthe same time progress toward the other edge thereof, the completion of the full bodily travel of the saw being in a downward arc.

4. A rotary cut-off saw machine having a table and a pivotally mounted rotary saw movable through the table and the work, when cutting, in a rising arc of a radius less than that of the saw.

5. A rotary cut-off saw machine, comprising a saw table, a rotary saw normally be low the upper surface of the table, and a rockable support for the saw below the saw table and having its axis of rockln'g substantially on a level with the axis of rotation of the saw in the inactive or initial position of the rockable support, the rad us of movement of the support about 1ts p1votal axis being less than the radius of the saw and the rockable support having a range of movement to carry the axis of the saw over and beyond the axis of rocking.

6. A rotary cut off saw machine provlded with a saw table, a rotary s'aw normally located below the top surface of the table, and rockable means for moving the saw through work located thereon, said rockable means having means for supporting the saw in spaced relation to the axis of rocking with the radius of movement of the saw about the axis of rocking less than the radius of the saw.

7 A rotary cut off saw machine provided with a rotary saw, a saw table, a straight edge or abutment for positioning the work on the table, and rockable supporting means for the saw locating the latterin its initial position immediately below the levelof the upper surface of the table and adjacent to the work, said saw supporting means having a range of rocking movement through an a are of a radius less than that of the saw to lift the latter into engagement with the lower face of the Work on the table and move a the saw throughthe work toward the upper face thereof and also crosswise of the work toward one edge thereof.

8. A rotary cut off saw machine having a saw table, a rockable member located below the top of the table, a saw arbor mount ed on the rockable member to one side of the axis of rocking and spaced therefromby a distance less than the axis of rocking, a rotary saw on the saw arbor, and means for rocking the saw carrying member to raise the saw While rotating above and move it crosswise of the table. I

- 9. A rotary cut-off saw machineprovided with a saw table, a rockable member located below the. top of the table, a saw arbor mounted on said member to one side of its axis ofv rocking and spaced therefrom by a distance no greater than the radius of the saw, counterbalancing means on the other side of the axis of rocking, a saw mounted on the saw arbor, and means for moving the rockablemember to lift the saw above the saw table through a rising and then a falling arc of travel, the rockable member being located to cause the axes of rocking and of the saw arbor to be on substantially the same level, with the edge of the saw approximately at the table level in the initial or inactive position of thesaw, and to further cause the axis of the saw arbor to move over and beyond the axis of rockingbefore the completion of the full range o'ftravel of-the saw arbor, t I .7 I

10. A rotary cut-off saw machine provided with a saw table, a rockable member located below the table, a saw arbor mounted on the rockable member and spaced from the axis of rocking by a distance no greater than the radius of the saw, means for rockmg the rockable. member,and a stop for the rockable member for limiting the travel of the range of movement of the rockable member away from the stop being sufiicient to saw edge approximately at the table "level,

carry the saw arbor over and beyond the axis of rocking of the rockable member.

11. A rotary cut-ofi' saw machine provided with a saw table, a rockable carrier for 'a rotary saw located below the table with the axis of rotation of the saw spaced from the axis of rocklng of the carrler, means for rocking the carrier to move the saw through rockable carrier and the swinging frame at the idler pulley end thereof in rear of the idler pulleys for maintaining a constant relation therebetween to keep the belt taut in different positions of the rockable carrier.

12. A rotary cut off saw machine comprising a saw table, a rockable frame mounted in the machine below the saw table and rovided with a saw arbor on one side o its axis of rocking, a pulley on the saw arbor, means for rocking the frame from an initial position where the axis of rocking of the frame and the axis of the saw arbor are both in a substantially horizontal plane to move the saw arbor through a rising arc, a drive pulley mounted in a substantially fixed position at a low point on the machine,

an upright swinging frame between the drive pulley and the pulley of the saw arbor and provided with idler pulleys, a belt extending about the drive pulley, idler pulleys and'saw arbor pulley, and connections between the rockable frame at the idler pul-' ley end thereof and the swinging frame to maintain the relative positions of the two frames for maintaining the belt taut at all times, said connections consisting of a pair of bars each pivotally connected at one end to said swinging frame in rear of said idler pulleys and at the other end pivotally mounted-on the axis of the saw arbor.

1 In. testimony, that 1 claim the foregoing as my own, I have hereto aflixed my signa ture in the presence of two witnesses.

.Witnesses;

P, MARRON, JOSEF KEISER.